Unified description of the resonance peak and incommensuration in high-T-csuperconductors - art. no. 172508

We present a unified description of the resonance peak and low-energy incom mensurate response observed in high-T-c cuprate superconductors. We argue t hat both features have a purely magnetic origin and they represent universa l features of an incommensurate spin state both below and above the superco nducting transition temperature. In this description the resonance peak is the reflection of commensurate antiferromagnetism. Our theoretical scenario gives an account of the main features observed in various families of supe rconductors and predicts those not yet observed, like a resonance peak in L a2NiO4+x.